Definitions for corundumkəˈrʌn dəm
Random House Webster's College Dictionary
co•run•dumkəˈrʌn dəm(n.)
a mineral, aluminum oxide, Al2O3, noted for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically.
Category: Mineralogy
Origin of corundum:
1720–30; < Tamil kuruntam; akin to Skt kuruvinda ruby
Princeton's WordNet
corundom, corundum(noun)
very hard mineral used as an abrasive
Wiktionary
corundum(Noun)
An extremely hard mineral, a form of aluminum oxide with the chemical formula AlO, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.
Origin: From குருந்தம்.
Webster Dictionary
Corundum(noun)
the earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond
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